Theodor kempf



UNITED STATES PATENT OFFICE.

THEODOR KEMPF, OF BERLIN, GERMANY, ASSIGNOR TO THE OHEMISGHE FABRIK AUF AOTIEN, OF SAME PLACE.

PROCESS OF MANUFACTURING PERMANGANATES.

SPECIFICATION forming part of Letters Patent No. 326,657, dated September 22, 1885. Application filed June10,1-S-l. (No specimens.) Patented in Germany March 'I, 1884, No. 28,782; in England May 26,1884, No. 8,218; in

Belgium May 26, 1884, No. 65,267; in France May 26, 1884,

No. 162,357,- in Luxemburg May 27, 1854, No. 407; in Italy June 17, 1884, XXXIII. 395, and in Austria-Hungary November 26, 1884, N 35,078 and No. 53,933.

To all whom it may concern.-

Be it known that I, THEODOR KEMPF, doctor of philosophy, a subject of the King of Prussia, residing at Berlin, Prussia, German Empire, have invented certain new and useful Improvements in Processes of l/Ianufacturiug Pei-manganates; and I do hereby declare the followlng to be a full, clear, and exact description of theinvention, such as will enable others skilled in the art to which it appertains to make and use the same.

The present invention relates to the conversion of manganic acid saltsinto permanganicacid salts by means of the electric current. To this end 1 preferably arrange the electrodes in separate cells or divisions ofa vessel, formed by the interposition of porous walls, the negative electrode being suspended in water and the positive electrode in the solution of manganicacid salt. The action of the electric current passing through the cells results in the precipitation of the permanganic acid in the cell of the positive electrode, while the hydroxide of the metal presents itself under development of hydrogen in the cell containing the negative electrode. The same conversion of manganic-acid salts into permanganic-acid salts takes place if both electrodes are suspended in the solution of the manganic-acid obtained separately.

The process may be explained by the follow ing formula, M indicating the metal of the salt: M,MnO, H,O I MMnO, MOH H.

salt, but the metallic hydroxide is then not go Thus, for instance, if manganate of potash is 35 employed and the electrodes arranged in separate cells, as above described, permanganate of potash is formed in the cell containing the positive electrode, the hydroxide of potassium presentingitself underdevelopment of hydroo lic hydroxides by electrolytically treating the 50 solutions of the mauganic-acid salts, substantially as set forth.

In testimony whereofl affix my signature in presence of two witnesses.

' THEODOR KEMPF. \Vitnesses:

A. DEMELIUS, B. R01. 

